Kutheni le nto i-single-pass stainless steel welds isebenzisa i-FCAW isoloko isilela ukuhlolwa? UDavid Meyer noRob Koltz bajongisisa izizathu zezi ntsilelo
Umbuzo: Silungisa i-welded steel scrapers kwi-dryer system kwindawo emanzi.I-welds yethu ayiphumelelanga ukuhlolwa ngenxa ye-porosity, i-undercuts kunye ne-welds eqhekekileyo.Sidibanisa i-A514 ukuya kwi-A36 usebenzisa i-0.045 "i-diameter, yonke indawo, i-cored 309L, 75% Argon / I-25% yegesi yeCarbon Dioxide yokumelana nokunxiba ngcono.
Sazama i-carbon steel electrodes, kodwa i-welds yaphela ngokukhawuleza kwaye safumana insimbi engenasici ukwenza ngcono.Zonke ii-welds zenziwa kwindawo ephantsi, i-3/8 intshi. inokubangela ukuba iiwelds zethu zingasebenzi?
I-Undercut idla ngokwenzeka ngenxa yemilinganiselo yewelding engaphandle, ubuchule bokuwelda obungafanelekanga, okanye zombini. isantya sohambo esicothayo kakhulu.
Kuba umtyibilikisi ezama ukufaka i-3/8″.Ukwenzeka kokuphatha ngokugqithisileyo itotshi kusenokuba noxanduva ngokuyinxenye yokuwelda kwefillet enye enocingo oluncinci olunamacingo ahambahambayo.Nangona kunjalo, kubonakala ngathi isebenzisa isixhobo esingalunganga emsebenzini kunokuba umba wobugcisa, yiyo loo nto.
I-Porosity ibangelwa ukungcola kwi-weld, ilahleko okanye ukugqithisa kwegesi yokukhusela, okanye ukufunxa ngokugqithisileyo komswakama we-flux-core wire. , oku kunokuba yimbangela ephambili ye-voids.
Isinyithi sokuzalisa osisebenzisayo siso sonke isikhundla se-flux cored wire, ezi ntlobo zocingo zinenkqubo ye-slag ekhawulezayo yokukhenkcela.Oku kuyimfuneko ukuxhasa i-weld puddle xa udibanisa ngokuthe nkqo phezulu okanye ngaphezulu.Into engalunganga ye-slag yokukhenkceza ngokukhawuleza kukuba iqina phambi i-weld pool ngaphantsi kwayo.Ukuba iigesi zisakhululwa, zivame ukuvalelwa kwaye zivele kamva kwifom ye-pores okanye i-surface worm tracks.Oku kuphakanyiswa xa ukuwelda kwindawo ethe tyaba kunye nocingo oluncinci lwe-diameter kwaye uzama ukufaka idiphozithi enkulu. weld kwipasi enye, njengakwisicelo sakho.
Ukuqhekeka kwe-weld ekuqaleni kunye nokuyeka kwe-weld kunokubangelwa ezininzi zezizathu.Njengoko ubeka i-bead enkulu kunye nocingo oluncinci lwe-diameter, unokufumana i-fusion eyaneleyo (LOF) kwingcambu ye-weld. ukuqhekeka yinto eqhelekileyo ngenxa yoxinzelelo oluphezulu lwe-weld kunye ne-LOF kwingcambu.
Kulo bungakanani bocingo, kufuneka usebenzise ezimbini okanye ezintathu zokudlula ukugqiba i-3/8 ye-intshi ye-intshi. yilungise.
Nangona kunjalo, omnye umba onokudlala indima enkulu ekuqhekekeni kwe-weld yinqanaba elingalunganga le-ferrite kwi-weld, edla ngokuba yimbangela ephambili yokuqhawula ucingo lwe-309L lwaphuhliswa kwi-welding steel stainless to carbon steel kunokuba i-carbon steel to carbon steel. .I-chemistry ye-weld ethile yale mveliso iphinda ithathele ingqalelo enye isiseko sokuhlanjululwa kwesinyithi kuzo zombini iziseko zesinyithi.Ngoko ke, kwi-stainless to carbon steel applications, ezinye ii-alloys ezivela kwintsimbi engenasici zinceda ukulungelelanisa ukubunjwa kweekhemikhali kunye nokuvelisa ixabiso elamkelekileyo le-ferrite. filler metal kunye malunga 50% ferrite, ezifana 312 okanye 2209, uya kuphelisa ukuba kunokwenzeka ukuqhekeka ngenxa umxholo ferrite ephantsi.
Eyona ndlela ilungileyo yokubonelela ngokumelana nokunxiba okugqwesileyo kukudibanisa umdibaniso ngekhabhoni eqhelekileyo okanye i-electrode yensimbi engenastainless kwaye wongeze umaleko we-electrode engaphezulu. Nangona kunjalo, ukhankanye ukuba ubuphantsi kwemithintelo yexesha elixineneyo kwaye nakuphi na ukuwelda okudlula okuninzi. imeko yayingaphandle kombuzo.
Zama ukuguqula intambo enkulu ye-diameter, efana ne-1/16 intshi okanye enkulu.Ukusebenzisa i-gas-shielded flux-cored wire ilungile kuba ibonelela ngokucocwa kwe-weld engcono kunye nokukhusela ukugeleza komoya okungcono kuneengcingo ezingenayo i-flux. ucingo olukwindawo yonke, kuphela ucingo oluthe tyaba noluthe tyaba olunokunciphisa iporosity okanye ukulandelela iintshulube. Kufuneka kwakhona utshintshe isinyithi sokuzalisa ukusuka kwi-309L ukuya kwi-312 okanye i-2209.
I-WELDER, eyayisakuba yi-Practical Welding Today, ibonisa abantu bokwenene abenza iimveliso esizisebenzisayo nesisebenza ngazo yonke imihla.Eli phephancwadi liye lanceda abantu baseMntla Merika iminyaka engaphezu kwama-20.
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